“One is enough.”   There is a familiar question asked in restaurants everywhere. The hostess smiles and says, “Just one?” It’s a simple question, but it carries a quiet cultural assumption — that one is temporary, that one is waiting, that one is somehow less than. But for many women, one is not a lack. One is a choice. There comes a moment — whether on the road, in a quiet home, or in the middle of an ordinary day — when a woman realizes that no one is coming to fill the spa